Death of Pope Saint Linus, immediate successor of Saint Peter. Linus was elected in 67 A.D. and created the first fifteen bishops after the Apostles. He forbade women to enter a church with uncovered heads, a custom that survived nearly 2000 years until Vatican II liberals did away with that. During his pontificate the evangelists Saint Luke and Saint Mark were martyred. He is buried near St. Peter in the crypt below the altar.
Death of Saint Thecla who is said to have bribed the gatekeepers at the Roman prisons where Saint Paul was incarcerated in order that she could get inside and learn from the Apostle often for she had heard him preach and was so moved by the Word of God that she renounced her fiance and was baptized. She is said to have been in Paul's entourage in his journeys, all the way to his imprisonment.
Death of Saint Adaman. This Irish-born abbott of Iona wrote the life of Saint Columba.
On this day the Nazis began experimental gassing executions at Auschwitz in Poland. Millions of Jews and thousands of Catholics would be slain including the priest Saint Maximilian Mary Kolbe and Saint Edith Stein who Pope John Paul II canonized in 1998.